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L100's used particle board (ouch!) with walnut veneer. was MDF invented then? internal dampening on the original vertical array L100 was strangely done on only 3 of the 6 sides of the box--the opposing side in every case is left bare. the original L100's had a bit of a boomy bass, so i covered all sides except the baffel board and was surprised that it may almost no difference. the response may have been slightly tighter but was almost the same. a friend told me that insulation does not so much affect the fundamental but, rather higher harmonics in the mid bass. don't know if this is true but my experiment would leave me to believe that he is correct.

JBL claimed "high density" particle board was supposed to have less resonance than plywood, althoughhigh end diy of the day liked "marine plywood" which had no voids. As to the glass, it wasn' there to load the woofer or tune the box, although you could do that. Whenever there were two parallel walls one was covered to eliminate standing waves. So, their yours, if they sound better to you with more glass that is fine, but someone didn't screw up they covered three walls instead of six on purpose. I think they were trying to make that box sound just as large as they could an more glass wasn't the way to do it.

2121 enclosure volume

I know the 2121 wants a 0.5 cubic ft enclosure but would think this is over and above the 2121 driver volume. Does anyone have the internal dimensions for a 4343 subchamber for the 2121?
Bill Shenefeltwilliam.shenefelt@verizon.net

nice, so they lied about the ohms hehehe i have been looking at box designs in the library and its confusing. on one of the spec sheets, it says not to port the d130, but there is a cabinet design sheet that has a pretty big port drawn on it. so do i port or do i not port? thanks

4343 Cabinet Information

This thread is for the collection of stock Altec/JBL physical enclosure information. Any information is desired and will be archived. Here is an example of some information that might be of interest:

Hi Giscard,

I have tried to assemble in one Word document, information about the 4343 cabinets and how they maybe dissassembled. The information has been gathered from various submissions to the forums.
Since capturing it there has been some discussion about whether some specific information was correct (concerning an access panel on the rear of the 4343 .. mine appears to have one!).
Anyway, I wanted to knoe if this is the sort of thing that is intended for this thread and if you think the contents are arranged usefully.
Ideally the document would be updated as ideas crystallise, but that may be too much to expect.